1. Modified AssemblyInfo.cs (inspired by a song)....
    [assembly: AssemblyTitle("Listen to Yardbirds Class Library")]
    [assembly: AssemblyDescription("Classes of Things To Come")]
    [assembly: AssemblyConfiguration("Beginner Lesson Version")]
    [assembly: AssemblyCompany("Yardbirds Said It All, Ltd")]
    [assembly: AssemblyProduct("Shapes")]
    [assembly: AssemblyCopyright("Copyright 2004, Yardbirds Said It All, Ltd")]
    [assembly: AssemblyTrademark("Shapes is a trademark of Yardbirds Said It All, Ltd")]
    [assembly: AssemblyCulture("")]

    [assembly: AssemblyVersion("1.3.*")]

    Build and then view via Ildasm....

2. Write a square class in MoreShapes with the circle and triangle...
    using System;
    using System.Drawing;

    namespace MoreShapes
    {
        public class Square
        {
            double Side;

            public Square() : this(0d)
            {
            }

            public Square(double givenSide)
            {
                Side = givenSide;
            }

            public double Area()
            {
                // area = Side squared
                return Side * Side;
            }
        }

        public class Circle
        {
            double Radius;

            public Circle() : this(0d)
            {
            }

            public Circle(double givenRadius)
            {
                Radius = givenRadius;
            }

            public double Area()
            {
                // area = pi r squared
                return Math.PI * (Radius * Radius);
            }

            public void Draw()
            {
                Pen p = new Pen(Color.Red);
            }
        }

        public class Triangle
        {
            double Base;
            double Height;

            public Triangle() : this(0d, 0d)
            {
            }

            public Triangle(double givenBase, double givenHeight)
            {
                Base = givenBase;
                Height = givenHeight;
            }

            public double Area()
            {
                // area = 1/2 base * Height
                return 0.5F * Base * Height;
            }
        }
    }

    Build and then view via Ildasm....

3. ShapeUser refers to MoreShapes assembly...
    using System;
    <s>//using Shapes;</s>
    using MoreShapes;

    namespace ShapeUser
    {
        public class ShapeUser
        {
            public static void Main()
            {
                double radius = 2.0;
                Circle c = new Circle(radius);
                Console.WriteLine("Area of Circle (2.0) is {0:f}", c.Area());
                Console.ReadLine();
            }
        }
    }

    Build and then view via Ildasm....

4. I just added code to the ShapeUser Class....
            public static void Main()
            {
                double radius = 2.0;
                Circle c = new Circle(radius);
                Console.WriteLine("Area of Circle (2.0) is {0:f}", c.Area());

                double side = 2.5;
                Square sq = new Square(side);
                Console.WriteLine("Area of Square (2.5) is {0:f}", sq.Area());

                double bottom = 3.0;
                double height = 1.5;
                Triangle tr = new Triangle(bottom, height);
                Console.WriteLine("Area of Triangle (3.0, 1.5) is {0:f}", tr.Area());

                Console.ReadLine();
            }

    Build and then view via Ildasm....

5. There is a lot of info to display so use the "more" pipe....
        gacutil /l | more
            - OR -
        gacutil /lr | more

6. Strong Name - nothing to show here - learn by doing....

7. Global Assembly Cache - nothing to show here - learn by doing....